How to avoid
"characterset conversion buffer overflow" error in sql*loader? error # 00626.
I am not able to find this on internet please suggest me the solution for this.
What is the character set of the input datafile? You might try specifying the character set in the control file:
CHARACTERSET char_set_name LENGTH SEMANTICS CHARACTER
By default, if not specified, Oracle will use byte length semantics. Thus, if you define a field length in your control file as VARCHAR(20), in byte semantics you'd have 20 byte buffer, but in character length semantics you might have a 40 byte buffer. This would be my guess as to what could be the source of the error.
It's not a lot of help, but here's what the Oracle error manual has to say about that error:
SQL*Loader-00626: Character set
conversion buffer overflow.
Cause: A conversion from the datafile character set to the client
character set required more space than
that allocated for the conversion
buffer. The size of the conversion
buffer is limited by the maximum size
of a varchar2 column.
Action: The input record is rejected. The data will not fit into
the column.
It sounds like there isn't any way to work around this within SQLLoader. If it is affecting a small number of records then it may be easiest to simply handle those manually. If it is many records, then you probably need to find or create a different loading tool.
Just a few ideas for you to think about:
You could try to load different parts of the "string" into different fields in the database .. maybe that way you can work around the limitation.
You could try to do the character set conversion in a different tool .. some text editors may give you some options .. and then load the file without it requiring the conversion.
Not sure if there's any merit in these ideas, but hopefully you can work something out.
Thanks for all your help. This problem has been resolved. We split the file and loaded in chunks and it worked fine
Related
Reading a text file (which happens to be a PDS Member FB 80)
hFile = fopen(filename,"r");
and have reached up to the point in the file where there is only an empty line left.
FilePos = ftell(hFile);
Then read the last line, which only contains a '\n' character.
fseek(hFile, FilePos, SEEK_SET);
fails with:-
errno=(27) EDC5027I The position specified to fseek() was invalid.
The position specified to fseek() was returned by ftell() a few lines earlier. It has the value 841 in the specific error case I have seen. Checking through the debugger, this is also the value returned by ftell a few lines earlier. It has not been corrupted.
The same code works at other positions in the file, and only fails at the point where there is a single empty line left to read when the position is remembered.
My understanding of how ftell/fseek should work is succinctly captured by another answer on SO.
The value returned from ftell on a text stream has no predictable relationship to the number of characters you have read so far. The only thing you can rely on is that you can use it subsequently as the offset argument to fseek or fseeko to move back to the same file position.
It would seem that I cannot rely on the one thing I should be able to rely on.
My questions is, why does fseek fail in this way?
As z/OS has some file formats that are unique you might find the answer in this Knowledge Center article.
Given that you are processing a PDS member I would suspect that this is record level I/O which is handled differently than stream I/O which is more common in distributed implementations.
I do not know why fseek fails in this way, but if your common usage pattern is to use ftell to get the position and then fseek to go to that position, I strongly suggest using fgetpos and fsetpos instead for data set I/O. Not only will you avoid this problem that you are finding, but it is also better performing for certain data set characteristics.
I am a little confused, with the PUBDEF record in the OMF object format.
My assembler has generated a result which states the record is 4000 bytes, when it clearly is not so why would it do this?
Image of Hex view of OMF
The 0xa0 and 0x0f is the record length in little endian format,
please view the specificaiton: http://pierrelib.pagesperso-orange.fr/exec_formats/OMF_v1.1.pdf
It also appears to state that the strings are zero bytes in length and at one point even has just a zero string length with no string provided. Maybe I am reading the file wrong? I have spent hours now and am struggling.
If anyone can help me with my issue as I am writing a linker and cannot continue without understanding this.
Thanks
There is no PUBDEF record in the file. You seem to have miscalculated the previous record size:
0000:80 THEADR
000e:88 CoMENT
0032:96 LNAMES
0041:98 SEGDEF
004B:98 SEGDEF
0055:88 COMENT
005C:a0 LEDATA
006E:a0 LEDATA
007b:8a MODEND
Learn to use more sofisticated tools for OMF inspection, such as Tdump.exe or ODU.exe.
While reading the source code of SortableIntField, I noticed that this class avoids "UCS-16 surrogates" when converting an integer to a String (see method int int2sortableStr(int, char[], int) of NumberUtils.java).
What issue would these characters raise?
The comments of the given code are confusing, actually there is a mistake, Wikipedia:
Occasionally, articles about Unicode will mistakenly refer to UCS-2 as
"UCS-16". UCS-16 does not exist; the authors who make this error
usually intend to refer to UCS-2 or to UTF-16.
Your question #1: Why does SortableIntField avoid UCS-16 surrogates?
To decrease running time and to save space by avoiding endiness, for instance.
Your question #2: What issue would these characters raise?
Again, they would take more space and if the endiness is an issue, then also the running time would increase. And also remember to catch your exceptions, since otherwise you can put easily your server down.
I'm converting a WinForms app to Silverlight (VB.NET). What should I use instead of Char.ConvertFromUtf32 as it's not available to use in Silverlight?
UTF-32 is currently not part of Silverlight, so you have to find a way around the limitation. I think you should stop a moment and think exactly why you need to read UTF32-encoded text.
If you are reading such text from a database or a file on the server, I would perform the conversion server-side (if possible I would convert everything to UTF-8 and get rid of the UTF-32 data in one shot).
If you are parsing a user-provided file on the client side, I would detect the UTF-32 encoding and gently tell the user that the file encoding is not supported. UTF32 is pretty rare nowadays, so I guess it should not be a very common case (but I could be wrong not knowing your exact situation).
In order to detect the file encoding you have to look at the first few bytes (byte order mark) -more information here, if they are not present the task becomes much harder and involves some kind of heuristics based on character frequency.
From: https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/types/how-to-convert-between-hexadecimal-strings-and-numeric-types
You can use a direct cast, like:
// Get the character corresponding to the integral value.
string stringValue = Char.ConvertFromUtf32(value);
char charValue = (char)value;
Small warning, it will only work up to 0xffff. It will not work for high range Unicode from 0x10000 to 0x10ffff.
Also, if you need to parse \uXXXX, try this other question: How do I convert Unicode escape sequences to Unicode characters in a .NET string?
I'm grabbing some binary data out of my MySQL database. It comes out as a mysqlpp::sql_blob type.
It just so happens that this BLOB is a serialized Google Protobuf. I need to de-serialize it so that I can access it normally.
This gives a compile error, since ParseFromString() is not intended for mysqlpp:sql_blob types:
protobuf.ParseFromString( record.data );
However, if I force the cast, it compiles OK:
protobuf.ParseFromString( (std::string) record.data );
Is this safe? I'm particularly worried because of this snippet from the mysqlpp documentation:
"Because C++ strings handle binary data just fine, you might think you can use std::string instead of sql_blob, but the current design of String converts to std::string via a C string. As a result, the BLOB data is truncated at the first embedded null character during population of the SSQLS. There’s no way to fix that without completely redesigning either String or the SSQLS mechanism."
Thanks for your assistance!
It doesn't look like it would be a problem judging by that quote (it's basically saying if a null character is found in the blob it will stop the string there, however ASCII strings won't have random nulls in the middle of them). However, this might present a problem for internalization (multibyte charsets may have nulls in the middle).